The Google+ app has just received a pretty major update that brings bug fixes, some UI changes, and new features to Googles new social media venture. From the changelog in the Android Market:

Customize the main stream view to show streams from individual circles

Fixed some issues encountered by users with the Swype keyboard

Set permissions for who can start a huddle with you (Anyone, Your Circles, Extended Circles)

If someone you've never huddled with before invites you to a group huddle, you can now dismiss the invitation

New UI allows adding multiple people or entire circles to a huddle

Set photo as wallpaper

Performance improvements and bug fixes throughout the app

This addresses the biggest gripes I've been hearing about the mobile app -- a way to add entire circles to a huddle, and a way to customize which circles are visible in your main stream. I'm sure the Google+ team is still hard at work and things will only get better. If you don't have your Google+ invitation yet, be sure to hit the forums and sing out -- invites seem to be wide open. Download links for the Market are after the break.

are you using a QR code scanner?
on some apps, make sure your scanner is set to 'QR code' instead of 'Bar code'. attempting to scan it through the 'Bar Code' option will not be successful. (see app "QuickMark" for a bar code/qr code scanner)

Thanks for the reports! Lookin into it. If you continue to have trouble, maybe try installing the new version from the Desktop version of Market? +EVAN, Google Community Manager (+profile: http://t.co/QBxEf0y)

Has anyone found settings in the Google+ app or on the website itself to start arranging Nearby posts in the Stream by date instead of what seems to be random? I find posts from hours ago below posts from days ago & it bothers me.

I would also like an option to turn off my location from posts. I was on WiFi in my house the other day & it showed my EXACT home address instead the usual neighborhood approximation. Hopefully that is coming in an update or I am just overlooking a setting.

My experience with this update and the new market:
QR Code took me to the Google+ page where I saw Open or Uninstall. Opened my New Market directly and saw Google+ had an update, along with 2 other apps. Clicked the "Update all 3" button and successfully got the Google+ update.